. Electric railway journal . of meshes perlineal inch, of wire cloth, woven from brass wire, having thefollowing diameters for Diameters Sieves Nos. 10 and 18 inch Sieve No. 32 inch Sieve No. 70 inch Sieves Nos. 160 and 230 inch FIG. 4—EARLY ELECTRIC TRACK CONSTRUCTION (ABOUT1892), 9-IN. TRAM GIRDER RAIL SPIKED TO TIES There is little question but that the most importantitems are those relating to character, bearing power anddrainage of subsoil. The 1914 way committee reportabove mentioned classified subsoil as the controllingfactor in design and submitted a table g
. Electric railway journal . of meshes perlineal inch, of wire cloth, woven from brass wire, having thefollowing diameters for Diameters Sieves Nos. 10 and 18 inch Sieve No. 32 inch Sieve No. 70 inch Sieves Nos. 160 and 230 inch FIG. 4—EARLY ELECTRIC TRACK CONSTRUCTION (ABOUT1892), 9-IN. TRAM GIRDER RAIL SPIKED TO TIES There is little question but that the most importantitems are those relating to character, bearing power anddrainage of subsoil. The 1914 way committee reportabove mentioned classified subsoil as the controllingfactor in design and submitted a table giving data onthe bearing values of soils (see Table I). In 1915the committee again emphasized these factors andpresented a classification of soils (see Table II), asdetermined by the Department of Agriculture, with aconclusion that the classification of soils found in citystreets is desirable. Meanwhile the committee onstresses in track of the American Railway EngineeringAssociation was carrying its experiments forward and. FIG. 5—BIRMINGHAM (ENGLAND) TRAMWAY CONSTRUC-TION, USING CONCRETE WITHOUT TIES,ABOUT 1890 now has in preparation a report on bearing values ofsoils which should be of great service. The 1892 report presented to the American StreetRailway Association previously mentioned had the fol-lowing to say in regard to subsoil and drainage: The depth of the excavation must be determined by thedepth of the rail and tie, plus the space allowed for tamp- September 21, 1918 Carry the War Workers and Help Beat the Kaiser 497 ing. The condition of the soil must govern the latter ex-clusively, but in the reconstruction of the roadbed, wherethe operation of cars will permit, and in all new work,unless the soil is of sandy character, the following planwill not only provide suitable subdrainage but will also in-sure permanency: Remove earth to a depth of 8 in. belowbottom of tie; roll thoroughly with a heavy horse or steamroller; spread a layer of cinders, crushed rock, grav
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